Hey,
Please check your survey (the survey corresponding to the survey file you are using to import) for errors under "Survey Logic File". There might be some syntax errors or some of the question codes with wrong syntax or repeating.
If possible please upload the lss file.

when i remove the token content in EM, this problem still there. it must related to the token table.
reproduce this problem:
1.creat survey with token
2.do the survey several times, then token has record.
3. deactive the survey
4.run check survey logic file
5. you can see the problem